Require callers of Config::AddConfigChangedCallback and
CPUThreadConfigCallback::AddConfigChangedCallback to handle the returned
ConfigChangedCallbackIDs to hopefully prevent future issues with
callbacks getting called after their associated objects have been
destroyed.
Use a single lambda as a callback which calls InitCustomPaths and
RefreshConfig instead of having separate callbacks for each of them.
This fixes the callback for InitCustomPaths not being removed on
shutdown; the callback for the lambda (previously for RefreshConfig) is
already removed in Shutdown().
Prevent SetHardcoreMode from being called after m_client is set to
nullptr. rc_client_set_hardcore_enabled() checks for nullptr so this
didn't cause any problems, but better not to rely on that.
Also prevents multiple SetHardcoreMode callbacks from piling up when
repeatedly toggling Config::RA_ENABLED.
Remove ConfigChangedCallback in MainWindow's destructor to prevent the
callback from accessing the destroyed MainWindow afterward.
After MainWindow is destroyed UICommon::Shutdown calls
LogManager::Shutdown which ultimately triggers any remaining callbacks.
This resulted in calling MainWindow::OnHardcoreChanged, which crashed in
debug builds and didn't have any obvious effect in release builds.